Machine for swaging needle-blanks



(No Modem 4 WfH. DAYTON.-

l MACHINE POR SWAGI-N'G NEEDLE BLANES. l\T0.26-8,87L1.`

D m, P a E i q am UNITED VSTATES PATENT OEEICE.

NVILLIAM H. DAYTON, OF TORRINGTON, CONNECTICUT.

MACHINE FOR swAGlNG NEEDLE-BLANKS.

SPECIFICATION forming part of Letters Patent No. 268,874, dated December 12, 1882, Application filed March 24, 1882. (No model.)

To all whom it may concern:

Be it known thatI, WILLIAM H. DAYTON,

' of Torrington, in the county of Litchfield and State of Connecticut, have invented an Im' provement in Machines for Swaging Needle- Blanks and other Cylindrical Articles, of which the following is a specification.

In Letters Patent No; 52,493, granted to Hopson, Brooks, and Manville, the wire to be vreduced or pointed is passed in between two jaws that are closed by a toggle motion, and in the Patent No. 58,730, granted to E. J. Manville, a pair4 of dies and toggles are employed in connection with a ring that supports the toggles.

My present invention is an improvement upon the aforesaid devices,whereby the mechanism is relieved from considerable friction at the same time that its 'efficiency is promoted and the parts are rendered more durable.

I employ a revolving shaft having across its end a mortise or groove and a pair of sliding dies similar to those in the said Patent No. 58,730, and around the same is a cylindrical shell, and there are rollers between the dies and the shell, said rollers having their axes in ringbearings, so as to roll around within the shell by the action upon them of the dies, the ends of which dies come into contact with the rollers successively, and the rollers, being at opposite sides within the shell, act as rolling toggles to press the dies together. In this manner there are as many closures ofthe dies each revolution of the shaft as there are rollers in the circular range, and the parts are constantly in motion, so that there is an extended wearing-surface on the interior of the shell and the exterior of the rollers. Hence the apparatus isvery durable, and there is but little friction of the parts. f

In the drawings, Figure l is a longitudinal section of the machine, and Fig. 2 is a crosssection at the line fr. 4

The shaft a has across its end a groove or 'mortise, into which are received the dies c'c,

in which are the semicirculur grooves for the swaging of the needle-blank or other articlesuch as a rod, shaft, or bar-and the cap-plate f is fastened to the end of the shaft by screws, and it is provided with the adjusting-screws i, that enter holes iu the dies to regulate the eX- plete set ot' dies of larger size.

tent of opening of the dies, Isubstantially the same as in the said Patent No. 58,730. I remark that, if desired, the shaft a may be tubular for the passage of the wire, rod, shaft, or bar that is operated on, and the parts may be of any desired size. If the shaft bis revolved by the pulley 7c or otherwise, the article to be acted upon will only requiretobefed in gradually and be freeto be revolved by the action of the dies as they move slightly while grasping such article; or if the article is revolved automatically the dies and shaft a may remain stationary while the shell b'is revolved by power. This shell b is made as a cylinder, and

between its inner surface and the shaft @there l is a circular range of cylindrical rollers, l, the axes of which are supported by and revolve in the rin g-bearin gs n n. There are eight of these rollers shown. The number may be more or less. The rollers roll upon the interior surface vof the shell b, and the ends of the dies c, as

a radial plane passing through the axis of the,

roller with which such die is in contact.

I have shown in Fig.3an elevation of a com- I prefer to make these dies doublethat is, with a dieface at each end of the blocks of metal c c-an'd there are followers o o, against the rounded exteriors of which the rollers Z act in the swaging operation. "When the die-faces in the center are worn they are resurfaced and rebored, and it becomes necessary to useilling-pieces r to compensate for the metal removed, and I use anythickuess or number of filling-pieces required. Thedie-blocks having faces at both ends allows of .their being turned end for end and used for a longer period without requiring to be resurfaced andrbored. The dies and rollers do not slide one on the other, but the con tact is a rolling movement. Hence there is but little friction, and the power is expended to the best advantage in compressing the article that is placed between the dies, thereby cold-swaging the same, so as to reduce a wire to a needle-blank, or to straighten or point wires or rods, or to straighten and render uniform in size rods or shafts. I remark that Where two dies are used there must he an even number ot' rollers, so that they act at opposite sides of the circular shell. It' there are three dies c placed radially at equal distances apart of one hundred and twenty degrees, there lmust be six, nine, or twelve rollers.

I claim as my inventionl. The com bination, with the dies c and shaft a, of the cylindrical shell b and circular range of rollers, substantially as set forth.

2. The combination, with the diescand shaft signed by me this 14th day of March, D.

WILLIAM H. DAYTON.

XVitnesses GIDEON H. WELCH, JEssE B. ROSE. 

